25 citations · 45 across the 2 of their papers we have counts for
5 papers
Free-moving Quantitative Gamma-ray Imaging
Daniel Hellfeld, Mark S. Bandstra, Jayson R. Vavrek +11
The ability to map and estimate the activity of radiological source distributions in unknown three-dimensional environments has applications in the prevention and response to radio…
Improved Gamma-Ray Point Source Quantification in Three Dimensions by Modeling Attenuation in the Scene
M. S. Bandstra, D. Hellfeld, J. R. Vavrek +8
Using a series of detector measurements taken at different locations to localize a source of radiation is a well-studied problem. The source of radiation is sometimes constrained t…
Reconstructing the Position and Intensity of Multiple Gamma-Ray Point Sources with a Sparse Parametric Algorithm
Jayson R. Vavrek, Daniel Hellfeld, Mark S. Bandstra +8
We present an experimental demonstration of Additive Point Source Localization (APSL), a sparse parametric imaging algorithm that reconstructs the 3D positions and activities of mu…
Modeling Aerial Gamma-Ray Backgrounds using Non-negative Matrix Factorization
M. S. Bandstra, T. H. Y. Joshi, K. J. Bilton +2
Airborne gamma-ray surveys are useful for many applications, ranging from geology and mining to public health and nuclear security. In all these contexts, the ability to decompose…
Observations of the Prompt Gamma-Ray Emission of GRB 070125
Eric C. Bellm, Kevin Hurley, Valentin Pal'shin +17
The long, bright gamma-ray burst GRB 070125 was localized by the Interplanetary Network. We present light curves of the prompt gamma-ray emission as observed by Konus-WIND, RHESSI,…